Testo's humidity transmitter are all built around the centrepiece, the Testo humidity sensor. An external inter-laboratory test at various national calibration institutes provides independent confirmation of its high long-term stability which has since been highly valued in practical applications many times over. Building on this, a comprehensive range of transmitters are offered, from the simple air conditioning transmitter and standard models that have been tried and tested in industry through to special models. In the industrial devices, the expertise in humidity measurement is evidenced by special solutions for specific operating conditions, e.g. high humidity or H2O2 sterilization environments. Customers can of course equip their model with additional features that are standard in the industry as required by specifying the respective ordering code.